摘要
The Xiajinbao gold deposit is located in Yong’an-Xiayingfang-Maojiagou polymetallic metallogenic belt,which is animportant metallogenic belt in North China block.In this paper,we present a detailed study on fluid inclusions and stable isotopes ofthe Xiajinbao gold deposit,Hebei Province,China,aiming at discussing the ore source,evolution of ore-forming fluid andore-forming mechanism of the deposit.The macroscopic geological characteristics,S and Pb isotopic analysis results show that thesource of ore-forming materials is mainly from granitic magma,and subordinately from country rocks.H and O isotopic compositionfeatures indicate that the ore-forming fluid is mainly derived from magmatic water.Fluid inclusion characteristics show that theore-forming fluid experienced boiling during the early mineralization stage,which led to the precipitation of gold.Fluid mixingdominated the precipitation of the ore-forming materials during the middle and late stages.The gold precipitation was caused bywater/rock reaction throughout the whole ore-forming process.
下金宝金矿床位于永安—下营房—毛家沟金多金属成矿带。本文作者以河北下金宝金矿床流体包裹体和稳定同位素为研究对象,分析了本区成矿物质来源、成矿流体来源及其演化,进而探讨本矿床的成矿机理。宏观地质特征和S、Pb同位素示踪结果表明,本区成矿物质主要由下金宝花岗质岩浆提供,部分来源于围岩。H、O同位素组成特征显示,本区成矿流体来源于岩浆水。流体包裹体特征表明,本区早阶段的成矿流体在演化过程中发生了沸腾作用,导致金的沉淀,中、晚阶段成矿物质沉淀的主导因素为流体的混合作用,而水/岩反应促使金沉淀的现象贯穿成矿的始终。
基金
Project(2015CX008) supported by the Innovation Driven Plan of Central South University,China
